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COLLEGE ZOOLOGY 



Bran'chi-os"te-gite (Gr. branchia, gills; tege, 



roof). The portion of the exoskeleton that 



covers the gills in higher crustaceans (e.g., 



crayfish ) . 

 Bron'chus (Gr. bronchos, windpipe). Either 



one of the two main branches of the trachea 



of a lung-breathing vertebrate. 

 Buc'cal (L. bucca, cheek or mouth cavity). 



Pertaining to the mouth or oral cavity. 

 Bud (Gr. beutie, bag). The developing lateral 



branch of an organism such as the hydra; 



term usually used for a young organism pro- 

 duced by budding. 

 Bud'ding. The production of offspring by the 



development of a lateral branch from a part 



of the body. 

 Bul'bus ar-te'ri-o"sus (L. bulhiis, akin to. Gr. 



arterio, artery). The enlarged bulblike base 



of the ventral aorta found chiefly in the bony 



fishes. 

 Bulia (L. bulla, water bubble) . A hollow bony 



growth such as the tympanic bulla. 

 Bur'sa (L. bursa, purse). A pouch or saclike 



structure such as the bursa of a joint. 



Cal-ca're-ous (L. calcarius, limestone, limy). 

 Chalky; composed of or containing calcium 

 carbonate (CaCog) or other carbonates. 



Cal-cif'er-ous glands (L. calx, lime; ferre, to 

 carry). Structures that lie at the sides of the 

 esophagus of some annelids (e.g., earth- 

 worms ) . 



Cap'il-la-ry (L. capillaris, from capillus, hair). 

 One of the many minute branches of blood 

 vessels that carry blood directly to the tissues 

 of the body in many animals. 



Car'bo-hy"drate (L. carbo, coal; Gr. hydor, 

 water). An organic compound, such as sugar 

 or starch, composed of carbon, hydrogen, 

 and oxygen, the last two in the same propor- 

 tion as in water (HoO). 



Car'di-ac (Gr. kardia, heart). Pertaining to the 

 heart. 



Car-niv'o-rous (L. caro, flesh; vorare, to de- 

 vour). Eating or living on other animals. 



Ca-rot'id (Gr. karos, heavy sleep; from the be- 

 lief that the carotid arteries cause drowsi- 

 ness). The principal artery leading to the 

 head. 



Car'pals (L. carpus, wrist). The bones of the 

 wrist. 



Caste (L. castus, pure). Any one of the types 

 belonging to any single species of social in- 

 sects. 



Ca-tab'o-lism or ka-tab'o-lism (Gr. kata, down; 

 ballein, to throw). The breaking down or 

 destructive phase of metabolism; the meta- 

 bolic processes in which chemical breakdown 

 occurs, for example, respiration. 



Cau'dal (L. cauda, tail). Pertaining to the tail 

 or the posterior part of the body. 



Ce'cum (L. caecus, blind gut). A blind pouch 

 of the intestine in vertebrates, or similar 

 pouches elsewhere. 



Cell (L. cella, compartment). A small mass or 

 unit of protoplasm surrounded by a cell 

 membrane and containing one or more nu- 

 clei. 



Cel'lu-lar (L. cellula, little cell). Pertaining to 

 or consisting of cells. 



Cen'tral nerv'ous sys'tem. The brain and the 

 cord, including the dorsal root ganglion. Ab- 

 breviated C.N.S. 



Cen-tro-mere' (kinetochore) (Gr. feenfron, cen- 

 ter; Gr. meros, part). A point where the 

 spindle fiber is attached; this is a con- 

 stricted region of the chromosome and is 

 not colored by the usual chromosomal stains. 



Cen'tro-sonie (Gr. kentron center; soma, 

 body). A small differentiated area of a cell 

 containing the centriole. 



Cen'trum (L., center). The ventral body por- 

 tion of a vertebra from which spring the 

 spinous and transverse processes. 



Ce-phal'ic (Gr. kephale, head). Pertaining to 

 or situated near the head. 



CepR'a-li-za^tion. The tendency toward the 

 centralization of important parts, as the 

 sense organs, in the head or in the head 

 region. 



Ceph'a-lo-tho"rax (Gr. kephale, head; thorax, 

 breast). The body division formed by the 

 fusion of the head and thorax in some ar- 

 thropods. 



Cer'e-bel'lum (L. diminutive of cerebrum, 

 brain ) . The division second from the most 

 posterior part of the brain; it is associated 

 with muscular coordination in the higher 

 vertebrates. 



Cer'e-bral aq'ue-duct (L. cerebrum, brain. L. 

 aquaductus, from aqua, water; ductus, 

 canal). The canal between the third and 

 fourth \'entricles of a vertebrate brain. 



